Add `light_model_name` option for extended model configuration in `agent.py`

src/gaia_solving_agent/agent.py

@@ -22,6 +22,7 @@ from gaia_solving_agent.utils import extract_pattern
 
 # Choice of the model
 cheap_model_name = "meta-llama/Meta-Llama-3.1-8B-Instruct"
+light_model_name = "Qwen/Qwen2.5-32B-Instruct"
 balanced_model_name = "meta-llama/Meta-Llama-3.1-70B-Instruct"
 reasoning_model_name = "deepseek-ai/DeepSeek-R1-0528"
 vlm_model_name = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"  # For VLM needs